A cobpobation



c. H. HYMAN AND 1. F MUELLER.-

RAZOR.

APPLICATION FILED APR.26, I919- Paten 19m 1919;

I \f scpk have invented certain new provements in Razors, of which the follow- CHARLES H. HYMAN Ann JOSEPH F. MOELLEB,

4. In 1 SAFETY RAZOR COMPANY, or BISMARCK, NORTH DAKOTA, A CORPORATION OF NORTH DAKOTA.

Tc all whom it may concern:

Be it known that we, CHARLES H. HYMAN and JOSEPH F. MoEL nR, both citizens of the United States, and residents of Chicago, in the county of Cook and State of Illinois,

and useful Iming is a specification.

This invention relates to improvements in razors and has reference principally to razors of the safet type, although certain novel-features of t e blade are applicable to both safety and plain razors.

Among the objects sought by tion are, to providea razor well the invenadapted by reason of its'structural features to effect a ing shaving, to provide, in a safet smooth shave of the hollow and otherwise irregular portions of the face, to provide, in a safety razor, an improved uard for the cutting edge or edges of the b ade, to provide, in a safety razor, an improved back plate or clamp presenting a minimum of interference with the surface of the face =durrazor, a construction which may be assemb ed, disassembled and cleaned with a minium of time and trouble and to provide a new and im;.

proved safety razor blade having convex, concave and str'aightcutting edges disposed in such relation to each other as to afford a maximum convenience to the user in shav: a With these and other ob]ects 1n v1ew,.

. which will hereinafter appear, our invention consists in the novel structure of blade and novel structures and combinations of 006 rating parts hereinafter fully descri 'd, shown in the drawing and pointed out in the appended claims. r

In its preferred embodiment our invention includes a razor blade having a plurality of cutting edges, preferably at least three, one' of which is concave in the plane of the blade, another convex in the plane of the blade, and the third straight. accompanying drawings wehave illustrated a safety razor hav' four cutting edges, but it will be understd dd that this number may be increased or decreased without involving "any departurefrom the principle of the-inthereof. f

Specification of Letters Patent.

In theeach of which terminates ina laterally Sm'rns rn'rnin'r QFFICE.

RAZOR.

I Patented Dec,2, 1919.

Application filed April 26-, 1919. serial Nb. 292,812.

Fig. 5 is an elevational view of the art shown in Fig. 4 as viewed from the le t ofthe latter figure.

Fig. 6 is an elevational view-of the guardplate; and

Fig. 7 is an enlarged sectional detail on cHIc'AGo, ILLINOIS, ASSIGNORS To through edge portions of the black-plate,

blade, and guard-plate.

Referrlng to the drawin s, 10 designates,

as an entirety, the back-p ate which has a vfiat lnner side '11, a slightly concave outer side 12, and a beveled edge 13 extending entirely around its outer side. It will be observed that one edge 14 of this back plate is concave in the plane of the plate, the'opposite edge 15 is convex in the plane '0f"the plate, and the two intermediate opposite edges 16 are both straight. Centrally of the inner flat side of the plate is a polygonal boss 17, on the free end of which is a central threaded stud 18. Y I

'19 designates as an entirety th blade which is of the same general shape as t v e backplate butslightly larger. This blade has a cutting edge 20 that is concave in plane 17, as shown in Fig. 1, the blade resting against the flat. inner side of the back-plate 10. 'Theedges of the blade are beveled on both sides, as shown in Fig. 7, so that it can ing 23 that just fits over the polygonal boss be applied either'side up to the back-plate.

24 designates as an entirety the guardplate which, as shown in Fig. 6,'is a flat polygonal structure. having. the general shape of the back-plate and blade. On the-- edges of the guard-plate are a series of'outwardly pro ecting spaced narrow fingers 25, bent and or tip 26, (see Fig. 7) that overlies the y cutting edge of the bl'aile. The guard-plate is formed with a'centr l polygonal opening 27 that also fits over the polygonal boss 17 'behind the blade 19. It will be observed servingto accommodate t e polygonal boss 17 and clamp the guard-plate 24 and the blade 19 snugly against the back-plate 10.

The enlarged cupshaped inner end 29 ofthe handle also provides a wide bearing of the handle on the guard plate 24, thus holding the latter rigid against the blade.

The mode of use and advantages of the described construction'will be readily apparent from the foregoing description and drawing. For shaving the hollow or con: cave portions of the face the convex cutting edge 15 will be foundmost advantageous. For shaving the rounded and more or less convex portions such as the chin and the lowersides of the jaws, the concave edge will be found most advantageous. For

shaving the comparatively flat surfaces of the face the straight edges 16 will be used.

The concave formation of the outer side of the back-plate 10 is of material extent so as to be advantageous in shavin certain portions, such as the upper and under lips,

since, durin the shaving of these parts, the

concave sur ace is engaged with the nose and .the chin, and allows the blade to lie at. a

more" effective angle to the surface being shaved than is possible with the well known type of safetyiazor having a rounded or convex back-plate, or even ';a backplate with a flat outer side.

Furthermore, by bending the tips of the guard fingers over the edge of the blade, an

increased factorof safety is secured, since it is absolutely impossible for the user to cut himself with this construction, Whereas it is well known that the ordinary safety razor guard does not always prevent the user from cutting himself if the tool is carelessly. or

hastily used at an improper angle to the face. Our improved construction of guard may make it necessary to go over the same central tapped hole at its base engaged with said stud, the'enlarged inner end of said handle surrounding said polygonal boss and bearing against the outer side of said guard plate to clamp the latter and the blade against said back-plate.

2'. In a safety razor, the combination of a back-plate having a materially concave outer side and a flat inner side provided with a central polygonal boss and a threaded stud continuous with said boss, a flat razor blade having oppositely disposed substantially parallel convexly and concavely curved cutting edges,'straight cutting edges extending continuously between the corresponding ends of said curved cuttin edges, and a central polygonal openin tted to said boss, a flat guard plate having a central polygonal opening fitted to said boss, and a handle having a tapped hole engaged with said stud and operating to clamp said back-plate, blade and guard plate together.

CHARLES HfHYMA N. JOSEPH F. MOELLER. 

